arch/arm/mach-s3c2412/irq.c

   1 /* linux/arch/arm/mach-s3c2412/irq.c
   2  *
   3  * Copyright (c) 2006 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20 */
  21
  22 #include <linux/init.h>
  23 #include <linux/module.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/ioport.h>
  26 #include <linux/ptrace.h>
  27 #include <linux/sysdev.h>
  28
  29 #include <asm/hardware.h>
  30 #include <asm/irq.h>
  31 #include <asm/io.h>
  32
  33 #include <asm/mach/irq.h>
  34
  35 #include <asm/arch/regs-irq.h>
  36 #include <asm/arch/regs-gpio.h>
  37
  38 #include <asm/plat-s3c24xx/cpu.h>
  39 #include <asm/plat-s3c24xx/irq.h>
  40 #include <asm/plat-s3c24xx/pm.h>
  41
  42 /* the s3c2412 changes the behaviour of IRQ_EINT0 through IRQ_EINT3 by
  43  * having them turn up in both the INT* and the EINT* registers. Whilst
  44  * both show the status, they both now need to be acked when the IRQs
  45  * go off.
  46 */
  47
  48 static void
  49 s3c2412_irq_mask(unsigned int irqno)
  50 {
  51         unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
  52         unsigned long mask;
  53
  54         mask = __raw_readl(S3C2410_INTMSK);
  55         __raw_writel(mask | bitval, S3C2410_INTMSK);
  56
  57         mask = __raw_readl(S3C2412_EINTMASK);
  58         __raw_writel(mask | bitval, S3C2412_EINTMASK);
  59 }
  60
  61 static inline void
  62 s3c2412_irq_ack(unsigned int irqno)
  63 {
  64         unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
  65
  66         __raw_writel(bitval, S3C2412_EINTPEND);
  67         __raw_writel(bitval, S3C2410_SRCPND);
  68         __raw_writel(bitval, S3C2410_INTPND);
  69 }
  70
  71 static inline void
  72 s3c2412_irq_maskack(unsigned int irqno)
  73 {
  74         unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
  75         unsigned long mask;
  76
  77         mask = __raw_readl(S3C2410_INTMSK);
  78         __raw_writel(mask|bitval, S3C2410_INTMSK);
  79
  80         mask = __raw_readl(S3C2412_EINTMASK);
  81         __raw_writel(mask | bitval, S3C2412_EINTMASK);
  82
  83         __raw_writel(bitval, S3C2412_EINTPEND);
  84         __raw_writel(bitval, S3C2410_SRCPND);
  85         __raw_writel(bitval, S3C2410_INTPND);
  86 }
  87
  88 static void
  89 s3c2412_irq_unmask(unsigned int irqno)
  90 {
  91         unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
  92         unsigned long mask;
  93
  94         mask = __raw_readl(S3C2412_EINTMASK);
  95         __raw_writel(mask & ~bitval, S3C2412_EINTMASK);
  96
  97         mask = __raw_readl(S3C2410_INTMSK);
  98         __raw_writel(mask & ~bitval, S3C2410_INTMSK);
  99 }
 100
 101 static struct irq_chip s3c2412_irq_eint0t4 = {
 102         .ack       = s3c2412_irq_ack,
 103         .mask      = s3c2412_irq_mask,
 104         .unmask    = s3c2412_irq_unmask,
 105         .set_wake  = s3c_irq_wake,
 106         .set_type  = s3c_irqext_type,
 107 };
 108
 109 static int s3c2412_irq_add(struct sys_device *sysdev)
 110 {
 111         unsigned int irqno;
 112
 113         for (irqno = IRQ_EINT0; irqno <= IRQ_EINT3; irqno++) {
 114                 set_irq_chip(irqno, &s3c2412_irq_eint0t4);
 115                 set_irq_handler(irqno, handle_edge_irq);
 116                 set_irq_flags(irqno, IRQF_VALID);
 117         }
 118
 119         return 0;
 120 }
 121
 122 static struct sysdev_driver s3c2412_irq_driver = {
 123         .add            = s3c2412_irq_add,
 124         .suspend        = s3c24xx_irq_suspend,
 125         .resume         = s3c24xx_irq_resume,
 126 };
 127
 128 static int s3c2412_irq_init(void)
 129 {
 130         return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_irq_driver);
 131 }
 132
 133 arch_initcall(s3c2412_irq_init);